外源乙烯对未熟和完熟网纹甜瓜果实乙烯生物合成的影响  

Effect of exogenous ethylene on ethylene biosynthesis of immature and ripe muskmelon

作　　者：吕双双[1] 李天来[1] 吴志刚[2] 李馨[1] 

机构地区：[1]沈阳农业大学园艺学院,辽宁省设施园艺重点实验室,沈阳110161 [2]辽宁省农业科学院花卉研究所,沈阳110161

出　　处：《食品科技》2009年第8期24-28,共5页Food Science and Technology

基　　金：国家支撑项目(2006BAD07B04)

摘　　要：采用浓度为10μL/L的外源乙烯处理未熟和完熟网纹甜瓜（20℃、24h）研究外源乙烯对果实乙烯生物合成的影响。结果表明：无论果实是否达到完熟状态，外源乙烯处理使未熟和完熟网纹甜瓜果实的硬度迅速降低，但是不同成熟度的甜瓜果实对外源乙烯的敏感性存在差异，即与未成熟的果实相比，外源乙烯使成熟果实硬度下降的速度更快，果实中ACC含量、ACC合成酶和ACC氧化酶活性更高，从而使成熟果实的内源乙烯释放量显著高于未成熟果实；从对外源乙烯的响应时间来看，乙烯处理后的成熟果实中ACC含量、ACC合成酶和ACC氧化酶活性立即升高。而外源乙烯处理后的1～6d，未成熟果实中ACC含量、ACC合成酶和ACC氧化酶活性与对照果实差异不显著，但是随着贮藏时间的进一步延长，乙烯处理与对照差异水平逐渐加大，说明外源乙烯的处理未成熟果实存在滞后期。The aim of this investigation was to assess the influence of exogenous ethylene treatment on ethylene biosynthesis in immature and ripe muskmelon. Muskmelon was treated with ethylene of 10μL/L at 20℃ for 24 h and then the ripening process at the same temperature was observed for more 10 days. The results showed that the flesh firmness of immature and ripe muskmelon dramatically reduced by exogenous ethylene whether or not these fruit are mature. However, different maturity of fruits had various sensitive to exogenous ethylene. Compared with immature control, the flesh firmness of ripe fruit had faster rate ofdecline, the content of ACC and the activities of ACS, ACO were higher, then the endogenous ethylene fruit by the exogenous treatment.

关 键 词：乙烯生物合成 网纹甜瓜 成熟度 

分 类 号：TS255.1[轻工技术与工程—农产品加工及贮藏工程]